A: No. The Key only contains answers, not the original exercises or explanations. You need the main Middle School English Grammar and Composition textbook alongside it.
Don't just copy the answers. Solve the exercises in the main textbook first, then use the Key to understand where you went wrong.
is a vital companion for self-study or parental guidance. It provides: Verified Solutions
Learning when to use "who" vs. "whom" or "shall" vs. "will."